On the role of wave-particle interactions in the evolution of solar wind ion distribution functions

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378289%3A_____%2F10%3A00355922" target="_blank" >RIV/68378289:_____/10:00355922 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/67985815:_____/10:00481888

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

On the role of wave-particle interactions in the evolution of solar wind ion distribution functions

Popis výsledku v původním jazyce

We investigate the role of kinetic effects in the solar wind expansion using 1-D numerical hybrid simulations. The analysis of proton distribution functions in the solar wind shows a non-adiabatic evolution and suggests that several kinetic processes areat work during the expansion. From simulation studies wave-particle and wave-wave interactions, as cyclotron heating and non-linear trapping due to parametric instabilities, are found to play an important role on constraining the proton temperature anisotropy and generating secondary velocity beams. We report results from hybrid comoving simulations that self-consistently retain and describe these processes. We find that cyclotron interactions control the evolution of the proton temperature anisotropywith distance providing a perpendicular heating which contrasts the adiabatic cooling caused by the expansion. At the same time ion-acoustic modes driven by parametric effects produce a velocity beam in the proton distribution function.

Název v anglickém jazyce

On the role of wave-particle interactions in the evolution of solar wind ion distribution functions

Popis výsledku anglicky

We investigate the role of kinetic effects in the solar wind expansion using 1-D numerical hybrid simulations. The analysis of proton distribution functions in the solar wind shows a non-adiabatic evolution and suggests that several kinetic processes areat work during the expansion. From simulation studies wave-particle and wave-wave interactions, as cyclotron heating and non-linear trapping due to parametric instabilities, are found to play an important role on constraining the proton temperature anisotropy and generating secondary velocity beams. We report results from hybrid comoving simulations that self-consistently retain and describe these processes. We find that cyclotron interactions control the evolution of the proton temperature anisotropywith distance providing a perpendicular heating which contrasts the adiabatic cooling caused by the expansion. At the same time ion-acoustic modes driven by parametric effects produce a velocity beam in the proton distribution function.

Druh

D - Stať ve sborníku

CEP obor

BL - Fyzika plasmatu a výboje v plynech

OECD FORD obor

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Projekt

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Návaznosti

Z - Vyzkumny zamer (s odkazem do CEZ)

Rok uplatnění

2010

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Twelfth International Solar Wind Conference. Proceedings Paper

ISBN

978-0-7354-0759-6

ISSN

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e-ISSN

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Počet stran výsledku

4

Strana od-do

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Název nakladatele

Melville

Místo vydání

New York

Místo konání akce

Saint-Milo

Datum konání akce

21. 6. 2009

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

000281438100053